In a balanced ionic equation, the atom as well as charge must balance.
If true enter 1, else enter 0.
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Solution

The correct option is A 1
In a balanced ionic equation the atom as well as charge must balance.
Total number of atoms of a given element on the L.H.S of the equation should be equal to the total number of atoms of that element on the RHS of the equation.
This should be true for all the elements. Total charge on the LHS of the equation should be equal to the total charge on the RHS of the equation.
For example, consider the following equation:
$H C l + N a O H ⇌ N a C l + H_{2} O$
Total number of Cl atoms on LHS = 2
Total number of Cl atoms on RHS = 2
Total number of Na atoms on LHS = 1
Total number of Na atoms on RHS = 1
Total number of H atoms on LHS = 2
Total number of H atoms on RHS = 2
Total number of O atoms on LHS = 1
Total number of O atoms on RHS = 1
Total charge on LHS = 0
Total charge on RHS = 0

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